U.S. patent application number 13/059756 was filed with the patent office on 2011-08-18 for method and device for heating a rotatably mounted guide casing of a guide roller.
This patent application is currently assigned to OERLIKON TEXTILE GMBH & CO. KG.. Invention is credited to Ludger Legge, Friedrich Lennemann, Tim Lutje, Claus Matthies.
Application Number | 20110200957 13/059756 |
Document ID | / |
Family ID | 41584650 |
Filed Date | 2011-08-18 |
United States Patent
Application |
20110200957 |
Kind Code |
A1 |
Matthies; Claus ; et
al. |
August 18, 2011 |
METHOD AND DEVICE FOR HEATING A ROTATABLY MOUNTED GUIDE CASING OF A
GUIDE ROLLER
Abstract
The invention relates to a method and a device for heating
rotatably mounted guide casing of a guide roller for guiding and
heating threads. The guide roller has a guide casing which is held
on the circumference of an axle support by means of an air bearing.
To heat the guide casing, compressed air is heated outside the
guide roller and supplied to the air bearing within the guide
roller.
Inventors: |
Matthies; Claus; (Wasbek,
DE) ; Lutje; Tim; (Borgdorf-Seedorf, DE) ;
Legge; Ludger; (Ehndorf, DE) ; Lennemann;
Friedrich; (Neumunster, DE) |
Assignee: |
OERLIKON TEXTILE GMBH & CO.
KG.
Remscheid
DE
|
Family ID: |
41584650 |
Appl. No.: |
13/059756 |
Filed: |
August 26, 2009 |
PCT Filed: |
August 26, 2009 |
PCT NO: |
PCT/EP2009/061022 |
371 Date: |
April 27, 2011 |
Current U.S.
Class: |
432/29 ;
432/1 |
Current CPC
Class: |
D02J 13/00 20130101;
D02J 13/005 20130101 |
Class at
Publication: |
432/29 ;
432/1 |
International
Class: |
F24H 9/00 20060101
F24H009/00 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 1, 2008 |
DE |
10 2008 045 357.9 |
Claims
1. Method for heating a rotatably mounted guide casing of a guide
roller for guiding and heating threads, in which the guide casing
is held on the circumference of an axle support by means of an air
bearing, comprising: heating compressed air outside the guide
roller, and supplying the heated compressed air to the air bearing
for the guide casing.
2. Method according to claim 1 wherein heating includes: receiving,
in a separate compressed air heater, compressed air from a
compressed air source, and applying heat to the compressed air
while the compressed air is in the separate compressed air
heater.
3. Method according to claim 1 wherein the compressed air is heated
to a setpoint temperature, an actual temperature of the compressed
air is detected, and the heating of the compressed air is regulated
as a function of a deviation between the setpoint temperature and
the actual temperature.
4. Method according to claim 1 wherein supplying the heated
compressed air includes: distributing the heated compressed air
within the guide roller by means of a porous sliding casing in an
air gap of the air bearing.
5. Method according to claim 1 wherein supplying the heated
compressed air includes: distributing the heated compressed air
within the guide roller in an air gap of the air bearing via
multiple nozzle holes.
6. Device, comprising: a guide roller which has a rotatably mounted
guide casing and an axle support, an air bearing being provided
between the guide casing and the axle support, a compressed air
source, a compressed air line, which couples the compressed air
source to the air bearing, and a heating means to heat compressed
air associated with the compressed air line, the heating means
being disposed outside the guide roller.
7. Device according to claim 6 wherein the heating means is formed
by an electric compressed air heater which is connected in the
compressed air line between the compressed air source and a
compressed air connection for the guide roller.
8. Device according to claim 6, further comprising: a heat control
system, and a temperature sensor for detecting an actual
temperature of the heated compressed air, the heat control system
and the temperature sensor being associated with the heating
means.
9. Device according to claim 7 wherein the air bearing is formed by
an air gap between the guide casing and a porous sliding casing,
the porous sliding casing being held at the circumference of the
axle support, at which at least one annular chamber which is
connected to the compressed air connection is provided.
10. Device according to claim 9, wherein the porous sliding casing
is formed from an open-pore sintered metal or sintering coal.
11. Device according to claim 7 wherein the air bearing is formed
by an air gap between the guide casing and the axle support, the
axle support having multiple nozzle openings at the circumference
which are connected to the compressed air connection and which open
into the air gap.
12. Device according to claim 6 wherein the guide casing has a
hollow cylindrical design and has a thrust ring at each of the two
ends, the thrust rings being connected to the guide casing in a
rotationally fixed manner and delimiting the air gap of the air
bearing toward both end faces.
13. A method of operating a melt spinning device, including (i) a
guide roller which has a rotatably mounted guide casing and an axle
support, an air bearing being provided between the guide casing and
the axle support, (ii) a compressed air source, (iii) a compressed
air line which couples the compressed air source to the air
bearing, and (iv) a heating means to heat compressed air associated
with the compressed air line, the heating means being disposed
outside the guide roller, the method comprising: guiding, heating
and stretching one or more threads through multiple godets, at
least one of the godets cooperating with the guide roller to guide
the thread.
14. Method according to claim 13 wherein a godet casing of one of
the godets and the guide casing of the guide roller are heated to
the same surface temperature.
Description
[0001] The invention relates to a method for heating a rotatably
mounted guide casing of a guide roller for guiding and heating
threads according to the preamble of claim 1, and a device for
carrying out the method according to the preamble of claim 6.
[0002] In the manufacture and processing of synthetic threads, it
is generally known to wrap one or more threads multiple times
around a driven godet casing of a godet so that the thread or
threads is/are conveyed through the driven godet casing as the
result of wrapping friction. To allow the multiple wrappings on a
godet casing, a guide roller having a rotatably mounted guide
casing for accommodating the thread wrappings is typically
associated with the godet. Such a guide roller is known from DE 26
39 439, for example.
[0003] The known guide roller has a rotatably mounted guide casing
which is rotatably held on an axle support by means of an air
bearing. Multiple heating means are associated with the axle
support in order to heat the guide casing and a thread which is
guided on the guide casing.
[0004] In the known guide roller, for heating the guide casing it
is necessary to conduct the energy from the center of the guide
roller, in this case, the axle support, to the outer guide casing.
The air bearing provided between the guide casing and the axle
support represents thermal resistance which results in
corresponding energy losses. Therefore, relatively high
temperatures must be generated at the axle support in order to heat
the guide casing to an external temperature of 100.degree. C., for
example. However, such heating in the axle support results in heat
deformation, which has an adverse effect on the air bearing. Thus,
in terms of energy the known guide roller is very unsuitable for
heating the guide casing to a desired surface temperature.
[0005] The object of the invention, therefore, is to provide a
method and a device for heating a rotatably mounted guide casing of
a guide roller, in which the heat energy may be supplied to the
guide casing in the most direct manner possible.
[0006] A further aim of the invention is to provide a method and a
device for heating a rotatably mounted guide casing of a guide
roller, which are suitable for retrofitting an unheated guide
roller to allow heating of the guide casing.
[0007] For a method according to the invention, this object is
achieved by heating compressed air and supplying the heated
compressed air to the air bearing.
[0008] For the device according to the invention for carrying out
the method according to the invention, the object is achieved in
that a heating means by which compressed air may be heated is
associated with the compressed air line outside the guide
roller.
[0009] Advantageous refinements of the invention are defined by the
features and feature combinations of the respective subclaims.
[0010] The invention is based on the knowledge that for an air
bearing, the compressed air which is supplied between the rotating
component and the stationary component is suited as a sliding
medium, also in the heated state. In this regard, the compressed
air may advantageously be used as a heat transfer medium in order
to directly conduct heat energy to the guide casing. The compressed
air cushion which is produced for the bearing of the guide casing
may also be advantageously produced using the heated compressed
air. The invention is therefore characterized in that no additional
devices for heating the guide casing are necessary at the guide
roller. The compressed air is heated outside the guide roller by a
heating means. The heating of the compressed air may thus be
carried out in a flexible manner. Thus, for example, the compressed
air may be heated directly within a compressed air line, using
external heating media associated with the compressed air line.
[0011] Particularly advantageous, however, is the refinement of the
invention in which the compressed air is heated in a separate
compressed air heater by supplying the compressed air to the
compressed air heater from a compressed air source. For this
purpose, the electric compressed air heater is connected in the
compressed air line between the pressure source and a compressed
air connection for the guide roller. This allows buffering of the
compressed air, which makes intensive heating possible.
[0012] Independent of the design of the heating means, it is
preferred to use the refinement of the invention in which the
compressed air is heated to a setpoint temperature, an actual
temperature of the compressed air is detected, and the heating of
the compressed air is regulated as a function of a deviation
between the setpoint temperature and the actual temperature. For
this purpose, a heat control system which is connected to a
temperature sensor for detecting an actual temperature of the
heated compressed air is associated with the heating means. It may
thus be ensured that a predetermined surface temperature may be
generated at the guide casing which is held essentially constant
for the entire operating time.
[0013] To obtain a uniform distribution of the compressed air at
the circumference of the guide casing within the air gap, the
refinement of the invention is particularly advantageous in which
the heated compressed air within the guide roller is distributed by
means of a porous sliding casing in an air gap of the air bearing.
It is thus possible for the heated compressed air to flow around
the hollow cylindrical guide casing in the interior, essentially
over the entire length. For this purpose, the porous sliding casing
is held at the circumference of the axle support, at which at least
one annular chamber which is connected to the compressed air
connection is provided. The heated compressed air is supplied, over
the entire bearing length extending in the axial direction, to the
air gap between the guide casing and the porous sliding casing.
This refinement of the invention is characterized in particular in
that intensive heating of the guide casing by the heated compressed
air is possible. Thus, surface temperatures at the guide casing in
the range of 200.degree. C. and higher may be achieved.
[0014] The refinement of the invention according to claim 5 and
claim 11 is particularly advantageous for conventional air bearings
in which the compressed air flows directly into the air gap of the
air bearing via nozzle openings. The heated compressed air is
distributed within the guide roller via multiple nozzle holes in
the air gap of the air bearing. The nozzle openings are
advantageously directly provided at the axle support, and are
connected to the compressed air connection. The air bearing is
formed by an air gap between the guide casing and the axle
support.
[0015] The invention is particularly suitable for guiding and
heating one or more threads within a manufacturing or processing
process. The use according to the invention in a melt spinning
device, in which one or more threads are guided through multiple
godets, heated, and stretched, represents a particular advantage
which allows continuous heating of the threads for multiple
wrappings on the godets. For this purpose, the multiply wrapped
threads are alternatingly heated at the heated surface of the godet
casing and at the heated surface of the guide roller. A cooling
phase, which is customary in the prior art for conventional guide
rollers, is no longer used.
[0016] Thus, use of the device according to the invention, in which
a godet casing of the godet and the guide casing of the guide
roller are heated to the same surface temperature, is particularly
advantageous.
[0017] Due to the high rotational speeds and low roll resistances
of the air-supported guide rollers, the invention may also be used
in particular for high thread speeds in the range of 4000 m/min and
higher in order to stretch multiple threads in a melt spinning
process, for example.
[0018] The invention is explained in greater detail below with
reference to several exemplary embodiments of the device according
to the invention, based on the accompanying figures which show the
following:
[0019] FIG. 1 schematically shows a side view of a first exemplary
embodiment of the device according to the invention for carrying
out the method according to the invention;
[0020] FIG. 2 schematically shows a side view of another exemplary
embodiment of the device according to the invention for carrying
out the method according to the invention; and
[0021] FIG. 3 schematically shows a view of a melt spinning device
for use of a device according to the invention.
[0022] FIG. 1 illustrates a first exemplary embodiment of the
device according to the invention for carrying out the method
according to the invention. A guide roller 1 is shown in a
cross-sectional view in the exemplary embodiment according to FIG.
1. The guide roller 1 has a rotatably mounted guide casing 2. For
this purpose the guide casing 2 has a hollow cylindrical design.
The guide casing 2 is held on an axle support 3 which at one frame
end 13 is fastened to a machine frame (not illustrated here). The
frame end 13 projects from the guide casing 2 at an end face of the
guide roller 1.
[0023] The axle support 3 extends essentially over the entire
length of the guide casing 2, and an air bearing 4 which passes
through the guide casing 2 is provided between the guide casing 2
and the axle support 3.
[0024] In the present exemplary embodiment, a sliding casing 7 is
situated at the circumference of the axle support 3 to form the air
bearing 4. The sliding casing 7 is formed from a porous material,
for example an open-pore sintered metal or an open-pore sintering
coal. In the overlap region between the sliding casing 7 and the
axle support 3, two adjacent annular chambers 6.1 and 6.2 are
provided at the circumference of the axle support 3. The annular
chambers 6.1 and 6.2 are connected to a compressed air channel 9
via multiple distribution holes 10 which extend radially in the
axle support 3. The compressed air channel 9 is provided in the
middle region of the axle support 3, and at the frame end 13 opens
into a compressed air connection 8.
[0025] The sliding casing 7 together with the guide casing 2 forms
a circumferential air gap 5, so that compressed air which is
supplied to the sliding casing 7 via the annular chambers 6.1 and
6.2 is led through the porous material of the sliding casing 7, and
uniformly enters the air gap 5 at the casing surface of the sliding
casing 7.
[0026] For axially fixing the guide casing 2 to the axle support 3,
thrust rings 11.1 and 11.2 are respectively associated with the
ends of the guide casing 2. The thrust rings 11.1 and 11.2 are each
connected to the guide casing 2 in a rotationally fixed manner. The
thrust rings 11.1 and 11.2 are fastened to the guide casing 2 in
relation to the end faces of the sliding casing 7 in such a way
that radial gaps 12.1 and 12.2 are formed between the respective
end faces of the sliding casing 7 and the thrust rings 11.1 and
11.2. The thrust rings 11.1 and 11.2 each have openings in the
middle region which connect the radial gaps 12.1 and 12.2 to the
surroundings.
[0027] The compressed air supplied to the air bearing 4 in the air
gap 5 is delivered via the compressed air connection 8 for the
guide roller 1. The compressed air connection 8 is connected to a
compressed air source 16 via a compressed air line 15. A heating
means 14 is associated with the compressed air line 15 for heating
the compressed air supplied to the compressed air connection 8. In
the present exemplary embodiment, the heating means 14 is formed by
a heating coil 17 which heats the compressed air line and the
compressed air guided therein. A heat control system 18 which is
connected to a temperature sensor 19 is associated with the heating
coil 17. The temperature sensor 19 is associated with the
compressed air line 15, just before the inlet into the compressed
air connection 8.
[0028] For the device illustrated in FIG. 1, in the operating state
a thread or also multiple parallel adjacently running threads
having a partial wrapping is/are guided at the circumference of the
guide casing 2 of the guide roller 1. The guide casing 2 is driven
to rotation by the thread or threads. For this purpose, compressed
air is continuously provided by the compressed air source 16 and
supplied to the compressed air connection 8 via the compressed air
line 15. The compressed air is heated to a predetermined setpoint
temperature by the heating coil 17 before entry into the guide
roller 1. The heated compressed air then passes through the
compressed air connection 8 and into the compressed air channel 9
of the axle support 3, and via the distribution holes 10 is
supplied to the annular chambers 6.1 and 6.2. The heated compressed
air then passes through the sliding casing 7 and continuously
enters the air gap 5 at the casing surface of the sliding casing 7.
An air cushion is thus formed between the guide casing 2 and the
sliding casing 7 which extends essentially over the entire length
of the air gap 5. The guide casing 2 is heated by the heated
compressed air, resulting in a predefined surface temperature,
necessary for the thread treatment, at the outer circumference of
the guide casing 2.
[0029] The heated compressed air which is continuously supplied to
the air gap 5 then passes into the surroundings of the guide roller
1 via the radial gaps 12.1 and 12.2. Thus, the bearing of the guide
casing 2 and continuous temperature equilibration of the guide
casing 2 are achieved at the same time.
[0030] To allow a predefined surface temperature to be maintained
at the guide casing 2, a heat control system 18 is associated with
the heating coil 17. The heat control system 18 is connected to a
temperature sensor 19 which continuously detects the temperature of
the compressed air which is introduced into the compressed air
channel 9 of the axle support 3. If a deviation between a
predefined setpoint temperature of the compressed air and a
measured actual temperature of the compressed air is determined
within the heat control system 18, the heating coil 17 is
controlled. In this manner temperature regulation may be provided
which ensures a constant compressed air temperature.
[0031] FIG. 2 schematically shows a second exemplary embodiment of
the device according to the invention. The exemplary embodiment is
essentially identical to the previous exemplary embodiment with
regard to design and function; therefore, at this point only the
differences are explained, and in other respects reference is made
to the above description. The components are denoted by the same
reference numerals.
[0032] For the device illustrated in FIG. 2, the guide casing 2 of
the guide roller 1 is mounted directly on the axle support 3. For
this purpose, the axle support 3 has a bearing section 31 which is
connected at an end face to the frame end 13 which is smaller in
diameter. Multiple uniformly distributed nozzle openings 22 are
provided at the circumference of the bearing section 31. The nozzle
openings 22 are connected via nozzle holes 21 to radially extending
distribution holes 10 which open into a middle compressed air
channel 9. The compressed air channel 9 is connected at the frame
end 13 to the compressed air connection 8.
[0033] The air bearing 4 is formed by the radially surrounding air
gap 5 between the axle support 3 and the guide casing 2. The air
gap 5 extends in the axial direction over the length of the bearing
section 31 of the axle support 3; the guide casing 2 has a thrust
ring 11.1 and 11.2, respectively, at each end of the bearing
section 31. The radially extending radial gaps 12.1 and 12.2
between the axle support 3 and the thrust rings 11.1 and 11.2 are
thus formed at the end faces of the bearing section 31.
[0034] In the present exemplary embodiment, compressed air is
supplied by a compressed air source 16 and a compressed air line 15
which is connected to the compressed air source 16 and to the
compressed air connection 8. A compressed air heater 20 which acts
as a heating means 14 is connected in the compressed air line 15 in
order to heat the compressed air. Thus, the compressed air supplied
by the compressed air source 16 is first led into the compressed
air heater 20 and heated to a predetermined compressed air
temperature. The heated compressed air from the compressed air
heater 20 is then supplied to the compressed air connection 8.
[0035] A temperature sensor 19 which is associated with the
compressed air channel 9 within the axle support 3 is provided for
controlling and regulating the compressed air temperature of the
heated compressed air. The temperature sensor 19 is connected to
the heat control system 18, which is coupled to the compressed air
heater 20 for control.
[0036] The function of the exemplary embodiment of the device
according to the invention for carrying out the method according to
the invention, illustrated in FIG. 2, is identical to the previous
exemplary embodiment according to FIG. 1, so that further
explanation may be dispensed with here.
[0037] The exemplary embodiments of the device according to the
invention illustrated in FIGS. 1 and 2 are examples of the design
of the guide roller 1, and in particular the design of the air
bearing 4. It is important that the compressed air supplied to the
air bearing 4 is heatable by a heating means situated outside the
guide roller. In this regard, the invention is particularly suited
for retrofitting guide rollers having cold guide casings which are
already installed in machines, so that the compressed air used for
the air bearing is supplied to the guide roller in the heated
state.
[0038] The invention may be used in a particularly advantageous
manner in melt spinning devices, in which freshly extruded threads
are guided through godet systems, heated, and stretched. FIG. 3
schematically shows one view of an exemplary embodiment of such a
melt spinning device. In this regard, only the components of a melt
spinning device which are essential for use of the device according
to the invention are illustrated. The melt spinning device has a
spinning head 23 which bears a spinneret 24 on its underside. The
spinning head 23 is connected to a melt source via a melt feed
inlet 32. A cooling shaft 25 as well as a godet system having a
draw-off godet unit 27 and a stretching godet unit 28 are situated
beneath the spinning head 23. The draw-off godet unit 27 is formed
by a godet 29.1 and a cold guide roller 30. The godet 29.1 has a
heated godet casing 33.
[0039] The downstream stretching godet unit 28 is formed by a
second driven godet 29.2 and a non-driven heated guide roller 1. A
compressed air source 16 and a compressed air heater 20 are
associated with the guide roller 1, so that the guide roller 1
according to the exemplary embodiment in FIG. 1 or 2 has a heated
guide casing 2. The godet casing 33 of the second godet 29.2 is
likewise heated.
[0040] In the exemplary embodiment of the melt spinning device
illustrated in FIG. 3, a thread 34 is spun from a polymer melt. For
this purpose, the polymer melt is extruded through the spinneret 24
into multiple filaments, which are combined into a filament bundle
26 after cooling. The filament bundle 26 is drawn off from the
spinneret 4 by means of the draw-off godet unit 27. For this
purpose, the thread 34 is wrapped multiple times around the
draw-off godet unit 27. The thread 34 is heated by the heated godet
casing 33 in order to be stretched by draw-off using the stretching
godet unit 28. The thread 34 is likewise guided with multiple
wrappings on the stretching godet unit 28, the thread being heated
at the surface of the heated godet casing 33 and at the surface of
the heated guide casing 2 of the guide roller 1 for thermal
aftertreatment. The thread is then wound onto a bobbin or subjected
to further treatment, for example crimping for manufacturing a
carpet yarn.
[0041] The surface temperatures set at the godet casing 33 and at
the guide casing 2 are preferably set to be equal in order to heat
the thread 34. Thus, for example, for a shrinkage treatment the
surface temperature could be in a range of 200.degree. C.
[0042] However, the draw-off godet unit 27 together with a driven
godet and heated godet casing may also be combined with the device
according to the invention. This design is illustrated in dashed
lines in FIG. 3.
LIST OF REFERENCE NUMERALS
[0043] 1 Guide roller [0044] 2 Guide casing [0045] 3 Axle support
[0046] 4 Air bearing [0047] 5 Air gap [0048] 6.1, 6.2 Annular
chamber [0049] 7 Sliding casing [0050] 8 Compressed air connection
[0051] 9 Compressed air channel [0052] 10 Distribution hole [0053]
11.1, 11.2 Thrust ring [0054] 12.1, 12.2 Radial gap [0055] 13 Frame
end [0056] 14 Heating means [0057] 15 Compressed air line [0058] 16
Compressed air source [0059] 17 Heating coil [0060] 18 Heat control
system [0061] 19 Temperature sensor [0062] 20 Compressed air heater
[0063] 21 Nozzle holes [0064] 22 Nozzle openings [0065] 23 Spinning
head [0066] 24 Spinneret [0067] 25 Cooling shaft [0068] 26 Filament
bundle [0069] 27 Draw-off godet unit [0070] 28 Stretching godet
unit [0071] 29.1, 29.2 Godet [0072] 30 Cold guide roller [0073] 31
Bearing section [0074] 32 Melt feed inlet [0075] 33 Heated godet
casing [0076] 34 Thread
* * * * *